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The GROUP BY clause is used in a SELECT statement to group rows into a set of summary rows by values of columns or expressions. The GROUP BY clause returns one row per group. The GROUP BY clause is often used with aggregate functions such as AVG(), COUNT(), MAX(), MIN() and SUM().
A GROUP BY clause, part of a SelectExpression, groups a result into subsets that have matching values for one or more columns. In each group, no two rows have the same value for the grouping column or columns.
This Oracle tutorial explains how to use the Oracle GROUP BY clause with syntax and examples. The Oracle GROUP BY clause is used in a SELECT statement to collect data across multiple records and group the results by one or more columns.
The GROUP BY statement groups rows that have the same values into summary rows, like "find the number of customers in each country". The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns.
In a query containing a GROUP BY clause, the elements of the select list can be aggregate functions, GROUP BY expressions, constants, or expressions involving one of these. Oracle applies the aggregate functions to each group of rows and returns a single result row for each group.
I have an SQL-query where I use Oracle CASE to compare if a date column is less than or greater than current date. But how do I use that CASE -statement in a GROUP BY -statement? I would like to count the records in each case.
Using the GROUPING function, you can distinguish a null representing the set of all values in a superaggregate row from a null in a regular row. The expr in the GROUPING function must match one of the expressions in the GROUP BY clause.
